Drive-head for casings for gas, oil, or other wells.



N0. 7|U,860. Patented Oct. 7, I902.

G. H. GUTHRIE. DRIVE HEAD FOB GASINGS FUR GAS, OIL, OR OTHER WELLS(Application filed July 18, 1901.)

(No Model.)

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GEORGE ll. GUTHBIE, OF ST. MARYS, OHIO, ASSIGNOR TO MUNOIE GAS ENGINEAND SUPPLY COMPANY, OF MUNOIE, INDIANA, A CORPORA- TION OF INDIANA.

DRWE HEAD FOR CASINGS FOR GAS, L, OR OTHER WELLS.

SPECIFICATION forming part of Letters Patent N0. 710,860, dated October'7, 1902.

Application filed July 18,1901. Serial No. 68,829. (No model.)

To (LZZ whmn it may concern:

Be it known that I, GEORGE H. GUTHRIE, a citizen of the United States,residing at St. Marys, in the countyofAuglaize and State of Ohio, haveinvented new and useful Improvements in Drive-Heads for Oasings for Gas,Oil, or other W'ells, of which the following is a specification.

This invention relates to certain new and usefulimprovements indrive-heads for drivepipes and casings for oil, gas, or other wells.

The invention aims to construct a drivehead which may be termed a dropdrivehead for oil and gas well drive-pipes and casings and aims toovercome the destroying of the threads on the casing-section andcoupling. The devices which are generally used for this purpose inconnection with oil-well casings are provided with threads, on which isscrewed the coupling for connecting the casing sections together, theobjection to drive-heads of this character being that any amount ofinconvenience is caused by the destroying of the threads both on thecasingsection and the coupling.

The object of this invention is to provide a head used in connectionwith oil-well casings which will drop inside the casing and rest on thetop of the coupling.

The invention further aims to construct a drive-head with an elongatedshank, so that when in position it will remain in the casingsection andnot injure the same nor the threads of the coupling.

The invention further aims to construct a drop drive-head for oil andgas well drivepipes and casings which shall be extremely simple in itsconstruction, strong, durable, efficient in its use, comparativelyinexpensive to manufacture; and to this end it consists in the novelcombination and arrangement of parts hereinafter more specificallydescribed, illustrated in the accompanying drawings, and particularlypointed out in the claim hereuntoappended.

In describing the invention in detail reference is had to theaccompanying drawings, forming a part of this specification, whereinlike numerals of reference indicate corresponding parts throughout theseveral views, and wherein- Figure 1 is a top plan view of my improvedhead. Fig. 2 is a vertical sectional View thereof; and Fig. 3 is avertical sectional View of an oil-well casing, showing my improved headattached thereto.

Referring to the drawings by reference-numerals, 1 indicates the uppersection of an oil Well casing, which is exteriorly screwthreaded and hassecured thereto the coupling 2, which projects above the same.

The reference-numeral 3 denotes the bit, and 4 the stem therefor, whichextends upwardly through the drive-clamps 5 6, secured together by thebolts 7,and is usually attached to the platform or derrick (not shown)when drilling oil-wells.

l have shown the foregoing, which forms no part of my invention, so thatthe arrangement of the drop drive-head in' connection with thecasing-section and couplingcan be understood.

The reference-numeral 8 denotes the body portion of the drive-head,which is substantially tubular and formed with a depending tubular shank9, the head and shank being hollow, with the external diameter of thedepending shank less than the external diameter of the body portion. Byforming the body and shank of two different diameters an annularshoulder 10 is formed at the juncture thereof, which is adapted to restupon the top edge of the coupling. The bodyportion is provided withopenings 11 for the purpose of connecting arope orother means thereto tofasten the head up to the stem, so as to keep it out of the road whenthey are disconnecting the bit from thestem. The head is used byslipping it upon the stem. The bit is then secured to the latter, whichis then inserted within the casing, and when the tool is pulled upthrough the casing the tool, being larger than the depending shank,elevates the head out of the casing and leaves the top of the casingclear to run the sand-pump. WVhen the tools are insertedin the casing,the head drops into place on the top of the coupling and the dependingshank extends within the coupling and easing, remains there and keeps.but it will also be evident that an immense amount of time and labor issaved by the employment of the drop drive-head constructed in the manneras hereinbefore set forth. The time saved is usually'from twenty tothirty minutes in adjusting the drive-head to each joint of pipe as itis driven in the well, as the screw drive-head has to be screwed on withlarge wrenches, which takes from twenty to thirty minutes at eachoperation, while by the employment of the construction of the drive-headas hereinbefore set forth it is simply dropped in the end of the pipe orcollar, or, in other words, it is not necessary for the drive-head to bescrewed to the coupling in any manner or to the pipe-section. This is amaterial advantage not possessed in the screw drive-heads usuallyemployed.

It is thought that the many advantages of a drop drive-head for oil-wellcasings constructed in the manner set forth can be readily understoodfrom the foregoing description, taken in connection with theaccompanying drawings, and it will also be noted that minor changes maybe made in the details of construction without departing from thegeneral spirit of my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

A drop drive-head for oil-Well casings, consisting of a hollow bodyportion provided with a pair of openings for the purpose of connecting asuitable means thereto to fasten the drive-head for the purpose setforth, and an elongated hollow shank integral with said body portion andhaving a smooth periphery, said shank of less diameter than said bodyportion, said body portion adapted to rest upon the upper end of thecasing when the drive-head is in operative position and said shankadapted to extend within and be freely removable from the casing whenthe body portion engages the top thereof.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

GEORGE H. GUTl-IRIE.

Witnesses:

HOBART Scorr, G. J. MAcoMBER.

